EP0533372B1 - Gas cylinder control system - Google Patents
Gas cylinder control system Download PDFInfo
- Publication number
- EP0533372B1 EP0533372B1 EP92307957A EP92307957A EP0533372B1 EP 0533372 B1 EP0533372 B1 EP 0533372B1 EP 92307957 A EP92307957 A EP 92307957A EP 92307957 A EP92307957 A EP 92307957A EP 0533372 B1 EP0533372 B1 EP 0533372B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- cylinder
- gaseous
- gas
- valve
- control
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D28/00—Shaping by press-cutting; Perforating
- B21D28/002—Drive of the tools
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
- B30B15/16—Control arrangements for fluid-driven presses
Definitions
- Such apparatus In a typical fine blanking apparatus, it is desired to accurately cut and punch a part.
- Such apparatus usually comprises an upper die and a lower die with one or more punches associated with the upper die and a punch base associated with the lower die, and movable with respect to the lower die.
- it has been common to provide a delay in the movement of the punch base upwardly after the part has been cut and punched from the workpiece.
- Such a time delay has been produced by cam control of the punch bases or by a hydraulic system associated with the punch bases.
- a typical example of a hydraulic system is shown in U.S. Patent No. 3,570,343.
- Such hydraulic systems have a disadvantage in that they require associated hydraulic fluid lines, valves and the like externally of the hydraulic cushion on the press.
- a hydraulic control system wherein a cylinder assembly includes a first piston associated with and exposed to the inert gas such as nitrogen in a manifold and a second piston engaged by the first piston and urged outwardly into engagement with a punch base.
- a hydraulic circuit is associated with the second piston and controlled by a valve such that upon downward movement of the first piston hydraulic fluid may flow freely without inhibiting the movement of the first piston, but upon actuation of the valve hydraulic fluid locks the first piston and thereby prevents it from moving upwardly until the valve is actuated so that a predetermined time delay is provided.
- a novel control system that utilized a gaseous control cylinder; which is easily maintained; which is low in cost; and which can be applied to die stamping systems or other machine systems.
- a gas cylinder control system according to claim 1 is provided.
- Fig. 1 is a partly schematic sectional view of a control system.
- Fig. 2 is a sectional view of a control valve utilized in the system shown in Fig. 1.
- Fig. 3 is a sectional view taken along the lines 3-3 in Fig. 2.
- Fig. 4 is a sectional view on an enlarged scale of one of the die cylinders shown in Fig. 1.
- a control system embodying the invention comprises one or more gaseous cylinders 10 that are mounted on a manifold 11.
- Each cylinder 10 includes a piston 12 with a shaft 13 extending to the exterior and adapted to be engaged by a portion of a machine system such as a die stamping machine.
- Such cylinders 10 may be of the type shown, for example, in U.S. Patent Nos. 4,342,448, 4,572,489 and 4,583,722.
- a plurality of die cylinders 10 are provided, each of which has a piston 12 and a rod 13 that functions, for example, in contact with a portion of a die of a press.
- the gaseous die cylinders 10 are associated with the manifold 11 which has a chamber 14 communicating with the open end of the cylinder 10 to apply gaseous pressure to the piston 12 of each cylinder urging the piston outwardly.
- a gaseous intensifier control valve 15 is provided in association with a gaseous intensifier control cylinder 16 that has a piston 17 and a rod end 18 also operated by the die or press in timed relationship with the rods and pistons of the die cylinders.
- the lower portion of the cylinder 16 beneath the piston 17 communicates through an opening 19 with a passage 20 that extends to a passage 21 in valve 15.
- An outlet passage 22 extends from the valve 15 to a passage 23 that communicates with the passage 24 to the rod end 13 of each piston 12.
- a reciprocable valve member 25 is movable in and out of sealing engagement with a valve seat 26 for opening and closing the valve 15.
- Passage 21 to the gaseous control cylinder 16 communicates on one side of seat 26 and passage 22 to the die cylinders communicate to the other side of seat 26.
- the valve member 25 is moved by operation of an air operated cylinder 27 that includes a piston 28 having a rod 29 that carries a cam 30 engaging a cam groove 31 for moving the valve member 25 toward and away from the seat.
- Air from a source is controlled by solenoid operated cylinder valve 32 for applying pressure to passage 22, 23 selectively or shifting the valve member 25 to and from open and closed positions.
- Each gas cylinder 10 is of conventional structure as shown in Fig. 4.
- the primary lines for example, have a pressure of approximately 1500 103 bar (psi) when the press is up, to approximately 1800 124 bar (psi) when the press is down.
- the secondary lines have a pressure of approximately 420 29 bar (psi) when the press is up; approximately 2520 174 bar (psi) when the press is down and the valve 15 is closed; and approximately 152 bar (2200 psi) when the press is down and the valve 15 is opened.
- the system is particularly useful in fine blanking and embodying the invention is intended to be used with a die stamping apparatus in a press wherein an upper die assembly is provided on the upper portion of the press and a lower die assembly is provided on the lower portion of the press.
- the upper die includes an upper punch that is movable by a die cushion downwardly to punch a slug from a workpiece.
- the lower die includes a lower pad associated with the punch and movable downwardly within the die.
- a punch base is supported by a plurality of cylinder assemblies as presently described.
- the cylinder assemblies are mounted on a manifold which is supplied with inert gas such as nitrogen under a predetermined high pressure.
- the pressure of the inert gas may vary between about 500 34 bar and 138 bar (2000 psi).
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Fluid-Pressure Circuits (AREA)
- Presses And Accessory Devices Thereof (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
- Punching Or Piercing (AREA)
Description
- In a typical fine blanking apparatus, it is desired to accurately cut and punch a part. Such apparatus usually comprises an upper die and a lower die with one or more punches associated with the upper die and a punch base associated with the lower die, and movable with respect to the lower die. In the forming of parts in order to insure the desired precision, it has been common to provide a delay in the movement of the punch base upwardly after the part has been cut and punched from the workpiece. Such a time delay has been produced by cam control of the punch bases or by a hydraulic system associated with the punch bases. A typical example of a hydraulic system is shown in U.S. Patent No. 3,570,343.
- Such hydraulic systems have a disadvantage in that they require associated hydraulic fluid lines, valves and the like externally of the hydraulic cushion on the press.
- In U.S. Patent No. 4,774,865, a hydraulic control system is provided wherein a cylinder assembly includes a first piston associated with and exposed to the inert gas such as nitrogen in a manifold and a second piston engaged by the first piston and urged outwardly into engagement with a punch base. A hydraulic circuit is associated with the second piston and controlled by a valve such that upon downward movement of the first piston hydraulic fluid may flow freely without inhibiting the movement of the first piston, but upon actuation of the valve hydraulic fluid locks the first piston and thereby prevents it from moving upwardly until the valve is actuated so that a predetermined time delay is provided.
- In U.S. Patent No. 4,934,230, there is shown a hydraulic control system wherein a hydraulic time delay circuit associated with said cylinder assemblies such that upon downward movement of the pistons, hydraulic fluid may flow freely without inhibiting the movement of the pistons, and upon actuation, hydraulic fluid locks the pistons against movement and thereby prevents them from moving upwardly until the circuit is actuated so that a predetermined time delay is provided.
- Reference is also made to DE-A-38 35 470 and US-A-2,918,272 which disclose further examples of hydraulic control systems.
- Among the objectives of the present invention are to provide a novel control system that utilized a gaseous control cylinder; which is easily maintained; which is low in cost; and which can be applied to die stamping systems or other machine systems.
- In accordance with the invention, a gas cylinder control system according to claim 1 is provided.
- Fig. 1 is a partly schematic sectional view of a control system.
- Fig. 2 is a sectional view of a control valve utilized in the system shown in Fig. 1.
- Fig. 3 is a sectional view taken along the lines 3-3 in Fig. 2.
- Fig. 4 is a sectional view on an enlarged scale of one of the die cylinders shown in Fig. 1.
- Referring to Fig. 1, a control system embodying the invention comprises one or more
gaseous cylinders 10 that are mounted on a manifold 11. Eachcylinder 10 includes apiston 12 with ashaft 13 extending to the exterior and adapted to be engaged by a portion of a machine system such as a die stamping machine. The gaseous fluid in thechamber 14 of the manifold 11, such as nitrogen, yieldingly urges thepiston 12 upwardly as viewed in Fig. 1.Such cylinders 10 may be of the type shown, for example, in U.S. Patent Nos. 4,342,448, 4,572,489 and 4,583,722. - In the preferred form of the invention shown in Figs. 1-4, a plurality of die
cylinders 10 are provided, each of which has apiston 12 and arod 13 that functions, for example, in contact with a portion of a die of a press. Thegaseous die cylinders 10 are associated with the manifold 11 which has achamber 14 communicating with the open end of thecylinder 10 to apply gaseous pressure to thepiston 12 of each cylinder urging the piston outwardly. A gaseousintensifier control valve 15 is provided in association with a gaseousintensifier control cylinder 16 that has apiston 17 and arod end 18 also operated by the die or press in timed relationship with the rods and pistons of the die cylinders. The lower portion of thecylinder 16 beneath thepiston 17 communicates through anopening 19 with apassage 20 that extends to apassage 21 invalve 15. Anoutlet passage 22 extends from thevalve 15 to apassage 23 that communicates with thepassage 24 to therod end 13 of eachpiston 12. Areciprocable valve member 25 is movable in and out of sealing engagement with avalve seat 26 for opening and closing thevalve 15.Passage 21 to thegaseous control cylinder 16 communicates on one side ofseat 26 andpassage 22 to the die cylinders communicate to the other side ofseat 26. Thevalve member 25 is moved by operation of an air operatedcylinder 27 that includes apiston 28 having arod 29 that carries acam 30 engaging a cam groove 31 for moving thevalve member 25 toward and away from the seat. Air from a source is controlled by solenoid operatedcylinder valve 32 for applying pressure topassage valve member 25 to and from open and closed positions. Eachgas cylinder 10 is of conventional structure as shown in Fig. 4. - In a typical example of operation, the following conditions will occur:
- 1. Press down - (gas in intensifier compressed to approximately 174 bar (2520 psi))
- 2. Electrical signal from rotary switch on press crank causes air valve and air cylinder to shift, opening nitrogen valve 15 (pressure drops to approximately 152 bar (2200 psi)) including on rod end of cylinder piston.
- 3. Delayed electrical signal causes
valve 15 to close. - 4. Press returns-up.
- 5. Electrical signal from rotary switch causes
valve 15 to open (pressure drops to approximately 29 bar (420 psi)). - 6. Delayed electrical signal causes
valve 15 to close. - Thus, the primary lines, for example, have a pressure of approximately 1500 103 bar (psi) when the press is up, to approximately 1800 124 bar (psi) when the press is down.
- The secondary lines have a pressure of approximately 420 29 bar (psi) when the press is up; approximately 2520 174 bar (psi) when the press is down and the
valve 15 is closed; and approximately 152 bar (2200 psi) when the press is down and thevalve 15 is opened. - The system is particularly useful in fine blanking and embodying the invention is intended to be used with a die stamping apparatus in a press wherein an upper die assembly is provided on the upper portion of the press and a lower die assembly is provided on the lower portion of the press. The upper die includes an upper punch that is movable by a die cushion downwardly to punch a slug from a workpiece. The lower die includes a lower pad associated with the punch and movable downwardly within the die. A punch base is supported by a plurality of cylinder assemblies as presently described. The cylinder assemblies are mounted on a manifold which is supplied with inert gas such as nitrogen under a predetermined high pressure. The pressure of the inert gas may vary between about 500 34 bar and 138 bar (2000 psi).
- It can thus be seen that there has been provided a novel control system that utilized a gaseous control cylinder; which is easily maintained; which is low in cost; and which can be applied to die stamping systems or other machine systems.
Claims (7)
- A gas cylinder control system for use with machine systems in timed relation such as die stamping systems that include :
a gaseous fluid cylinder (10) operated by a gas and adapted to operate periodically by a machine system,
a gaseous intensifier control cylinder (16) normally operated in timed relation with said gaseous cylinder (10),
said gaseous intensifier control cylinder (16) and said gaseous fluid cylinder (10) each having a piston;
means defining a passage (20-24) providing communication between the gaseous fluid cylinder (10) and the gas intensifier control cylinder (16),
said gaseous intensifier control cylinder (16) being of a size such that it operates at substantially higher pressure than said gaseous fluid cylinder (10) when said cylinders are moved to increase the pressure thereon, and
a gaseous intensifier control valve (15) provided in said passage (20-24) and operable to open the passage in timed relation to the operation of a machine system in order to lock the gas in the gaseous fluid cylinder (10) and prevent the gas cylinder (10) from moving until the control valve (15) is actuated thereby providing a predetermined time delay. - The control system set forth in claim 1, wherein said gaseous intensifier control cylinder (16) and said gaseous fluid cylinder (10) each have a piston including a rod end (18;13) and a piston end (17;12),
said passage (20-24) extending from the piston end (17) of said gaseous intensifier control cylinder (16) to the rod end of said gaseous fluid cylinder (10) such that when the control valve (15) is opened the pressure of gas on the piston end (17) of the gaseous intensifier control cylinder (16) is applied to the red end (13) of the gaseous fluid cylinder (10) to lock the gas in the gaseous fluid cylinder (10) into position. - The gas cylinder control system set forth in claim 1 or 2, wherein said gaseous intensifier control valve (15) comprises a body having a valve seat (26), a valve member (25) reciprocable in said body toward and away from said valve seat (26), said passage (20,21) from said gaseous intensifier control cylinder (16) communicating with one side of said valve seat (26), said passage (22-24) from said gaseous fluid cylinder (10) communicating with the other side of said valve seat (26).
- The gas cylinder control system set forth in claim 3 including means for moving said valve member (25) toward and away from said valve seat (26).
- The gas cylinder control system set forth in claim 4, wherein said means for moving said valve member comprises a camming member movable toward and away from said valve member, a cam (30) on one of said camming member and valve member and a cam track (31) on the other of said camming member and valve member.
- The gas cylinder control system set forth in claim 4 or 5, including a gaseous operating cylinder (27) including a piston (28) operatively connected to the movable camming member.
- The gas control system set forth in claim 3 and any of claims 4 to 6 when appended thereto, wherein said intensifier control valve (15) is solenoid operated.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US07/762,423 US5170627A (en) | 1991-09-19 | 1991-09-19 | Gas cylinder control system |
US762423 | 1991-09-19 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0533372A1 EP0533372A1 (en) | 1993-03-24 |
EP0533372B1 true EP0533372B1 (en) | 1995-11-15 |
Family
ID=25064995
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP92307957A Expired - Lifetime EP0533372B1 (en) | 1991-09-19 | 1992-09-02 | Gas cylinder control system |
Country Status (4)
Country | Link |
---|---|
US (1) | US5170627A (en) |
EP (1) | EP0533372B1 (en) |
JP (1) | JPH05200598A (en) |
DE (1) | DE69206092T2 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5588641A (en) * | 1993-11-26 | 1996-12-31 | Stromsholmens Mekaniska Verkstad Ab | Gas spring which after compression has a time delayed return to its original length |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5802944A (en) * | 1997-04-11 | 1998-09-08 | Livernois Research And Development Company | Gas cylinder with internal time delay |
GB2373469B (en) * | 1998-10-28 | 2003-02-19 | Ethicon Inc | A pneumatic press |
US6131497A (en) * | 1999-04-07 | 2000-10-17 | Forward Industries, Llc | Gas cylinder with time delay |
Family Cites Families (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US27801A (en) * | 1860-04-10 | Stop-valve | ||
US996692A (en) * | 1901-04-11 | 1911-07-04 | Samuel J Webb | Hydraulic compress with double-acting ram. |
US1763474A (en) * | 1925-12-31 | 1930-06-10 | Jr Heinrich Maurits Me Mattern | Reversing gear for reciprocating engines with hydraulically-operated valves |
US1988066A (en) * | 1933-08-28 | 1935-01-15 | John A Rykaczewski | Brake operating mechanism |
US2089279A (en) * | 1935-10-01 | 1937-08-10 | Int Motor Co | Electrical diesel air chamber valve control mechanism |
US2918272A (en) * | 1959-02-16 | 1959-12-22 | Floyd M Williamson | Hydraulic system for controlling the return movement of pressure pads in air cushionpresses |
US3229957A (en) * | 1962-06-15 | 1966-01-18 | Werner F Jehn | Force multiplying device |
US3347461A (en) * | 1965-10-04 | 1967-10-17 | Powers Regulator Co | Pneumatic-hydraulic pulse actuator |
US3759483A (en) * | 1971-05-14 | 1973-09-18 | T Baxter | Fluid actuated control valve |
CH584581A5 (en) * | 1974-07-03 | 1977-02-15 | Harcuba Siegfried | |
US3906726A (en) * | 1974-12-20 | 1975-09-23 | Halliburton Co | Positioner methods and apparatus |
DD267926B5 (en) * | 1987-12-14 | 1994-03-10 | Erfurt Umformtechnik Gmbh | BACK TRAY CONTROL FOR PULLERS AT PRESSES |
US5058385A (en) * | 1989-12-22 | 1991-10-22 | The United States Of America As Represented By The Secretary Of The Navy | Pneumatic actuator with hydraulic control |
-
1991
- 1991-09-19 US US07/762,423 patent/US5170627A/en not_active Expired - Fee Related
-
1992
- 1992-09-02 DE DE69206092T patent/DE69206092T2/en not_active Expired - Fee Related
- 1992-09-02 EP EP92307957A patent/EP0533372B1/en not_active Expired - Lifetime
- 1992-09-17 JP JP4247762A patent/JPH05200598A/en not_active Withdrawn
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5588641A (en) * | 1993-11-26 | 1996-12-31 | Stromsholmens Mekaniska Verkstad Ab | Gas spring which after compression has a time delayed return to its original length |
Also Published As
Publication number | Publication date |
---|---|
DE69206092D1 (en) | 1995-12-21 |
JPH05200598A (en) | 1993-08-10 |
EP0533372A1 (en) | 1993-03-24 |
US5170627A (en) | 1992-12-15 |
DE69206092T2 (en) | 1996-05-02 |
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